i want to know frequqncy doubler circuit in digital circuit
please show me the circuit in gate level

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Greetings sureh_m65,

As dave has indicated, it will be helpful for you to provide a detailed description of the requirements of your design. Such details will result in a more effective dialogue between you and the forum members to assist with your request for a voltage doubler design.

Until you have a chance to provide more details you can take a look at Figure 24 in the application note AN795 on the microchip website.

The circuit shown in figure 24 of this application note uses two voltage-to-frequency converters to construct a continuously adjustable frequency multiplier or divider. This circuit will take a digital input signal and output a digital signal whose frequency is proportional to the input frequency with the constant of proportionality set by the potentiometer.